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Dive into the research topics where Iva Bartáková is active.

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Featured researches published by Iva Bartáková.


Plant and Soil | 2001

Phytotoxicity of iron in relation to its solubility conditions and the effect of ionic strength

Iva Bartáková; Marie Kummerová; Martin Mandl; Michal Pospíšil

The effect of iron on root elongation and seed germination of Lactuca sativa was investigated within the limits of the plants sensitivity to an acidic environment and iron solubility under experimental conditions. Because ionic strength was found to have phytotoxic effects, the same pH and ionic strength conditions were kept constant over the entire iron concentration range, so as to evaluate solely the effect of iron. 0.14 mM Fe3+ was found to be the lowest effective concentration inhibiting root elongation. The low solubility of iron at a pH of 3 (the lowest value which could be applied for root elongation) excluded the testing of higher iron concentrations. Due to the lower sensitivity of seed germination to acidity, a pH of 2.6 could be applied in this case. The lowest effective iron concentration (the lowest applied concentration causing a significant decrease in germination as compared to the control, P < 0.05), EC50 (the concentration at which germination was 50% of that of the control specimens) and the completely effective iron concentration (the concentration that completely inhibited seed germination) were 0.6, 0.92 and 2.0 mM, respectively.


Process Metallurgy | 1999

Pyrite biooxidation: Electrochemical and kinetic data

Martin Mandl; Josef Zeman; Iva Bartáková; Helena Veselá

Studies on pyrite oxidation by Thiobacillus ferrooxidans , using a compact pyrite electrode, resulted in detection of 14 exchanged electrons. This indicates that the pyrite biooxidation to sulfate ions occurred at the pyrite surface without the formation of any sulfur intermediates. Exchange current density showed that the pyrite biooxidation rate was higher by one order of magnitude as compared to conditions without bacteria. Assuming sulfate is the final product, the initial rate of pyrite concentrate oxidation by ferric iron (up to 180 mM) was similar to the rate of pyrite concentrate oxidation by T. ferrooxidans in the absence of any significant ferric iron. Electrochemical and kinetic studies supported the indirect mechanism of pyrite oxidation based on iron-oxidizing activity of T. ferrooxidans .


Archive | 2010

Mobilization and phytotoxicity of iron under conditions ofbacterial oxidation of iron sulfides

Martin Mandl; Eva Pakostová; Jiří Kučera; Iva Bartáková; Pavel Bouchal; Oldřich Janiczek


Archive | 2005

Mechanismus bakteriální oxidace pyritu, dopady v ekologii abiohydrometalurgii

Martin Mandl; Šárka Helánová; Iva Bartáková; Josef Zeman


Chemicke Listy | 2005

Steady states establishment during pyrite oxidation

Iva Bartáková; Josef Zeman


Archive | 2004

Mechanismus biodegradace pyritu, ekologické souvislosti

Martin Mandl; Šárka Helánová; Iva Bartáková; Josef Zeman


Archive | 2003

Phytotoxicity of pyrite and arsenopyrite biodegradation products

Martin Mandl; Iva Bartáková; Marie Kummerová


Archive | 2002

Sulfide mineral biodegradation and phytotoxicity of the resulting products

Martin Mandl; Iva Bartáková; Šárka Helánová


Archive | 2000

Iron-oxidizing activity of Thiobacillus ferrooxidans duringpyrite oxidation

Martin Mandl; Josef Zeman; Iva Bartáková; Šárka Helánová


Archive | 1999

Biodegradace pyritových odpadů: mechanismus tvorby kyselinysírové

Martin Mandl; Josef Zeman; Iva Bartáková

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